possibility of pregnancy?

Well I had sex on the 23rd of Jan. I had my period on the 3rd of February. but it lasted 3 days when I normally have mine 5-6 days. I only had a light pink the first day, in the morning, and I put a tampon in, I took it out later that day, and nothing was on it just a tiny bit on the tip. Next day was the same, but late that night I had normal blood when I wiped, but it looked kinda brownish and almost like old blood. but then it stopped.Then that next morning, I wiped no blood at all just a light pink. and nothing else came. then I had sex again that morning. which was on the 6th of February. then ever since then, I've been having a major increase of discharge. Every time I went pee, I would look down there with a mirror and it would be covered with this white thin bubbly dishcarge, I felt wet all the time. then I was having these bad cramps for like 2 weeks. then they just stopped. I felt inside to see if anything was wrong, then I felt this big hard lump which I found out was my cervix. And it has been low and hard and closed since then. I went to the doctor last week, everything seemed to be fine, but he said he didn't know what was causing the discharge. he didn't have an infection or an std, so idk what's going on. I'm only 2 days late for my period though. but I haven't been cramping. my boobs aren't sore. and I'M not starving like I normally am before my period. and I haven't been cranky. and normally that all happens a week or so before my period. and last week I noticed these tiny blue veins around my nipple area. Maybe I'm just being really paranoid about all of this. what do you think?